public int Write(MemoryCursor cursor, int?minLength = null, ValueBuffer?mask = null)
{
if (minLength < 0)
{
throw new ArgumentOutOfRangeException(nameof(minLength));
}
var length = NetworkBitConverter.GetByteLength(value);
if (minLength.HasValue)
{
length = Math.Max(length, minLength.Value);
}
var bytes = cursor.Move(length);
NetworkBitConverter.WriteUnaligned(bytes.Span, value, length);
if (mask.HasValue)
{
Mask(bytes.Span, mask.Value);
}
return(length);
}
public static CursorWritingContext StartVectorWriting(MemoryCursor cursor, Range range)
{
var lengthSizeInBytes = NetworkBitConverter.GetByteLength((ulong)range.End.Value);
var lengthBytes = cursor.Move(lengthSizeInBytes).Span;
var startLength = cursor.AsOffset();
return(new CursorWritingContext(cursor, startLength, lengthBytes, range));
}
public static WritingContext StartVectorWriting(ref Span <byte> bytes, Range range)
{
var context = new WritingContext(bytes, range);
var lengthSizeInBytes = NetworkBitConverter.GetByteLength((ulong)range.End.Value);
if (bytes.Length < lengthSizeInBytes)
{
throw new EncodingException();
}
bytes = bytes.Slice(lengthSizeInBytes);
return(context);
}
public void Complete(ref Span <byte> bytes)
{
var offset = start.Length - bytes.Length;
var lengthSizeInBytes = NetworkBitConverter.GetByteLength((ulong)range.End.Value);
if (offset < lengthSizeInBytes)
{
throw new EncodingException();
}
var payloadLength = offset - lengthSizeInBytes;
if (payloadLength < range.Start.Value || payloadLength > range.End.Value)
{
throw new EncodingException();
}
NetworkBitConverter.WriteUnaligned(start, (ulong)payloadLength, lengthSizeInBytes);
}
public PacketNumber DecodeByLargestAcknowledged(PacketNumber largestAcknowledged)
{
var bits = NetworkBitConverter.GetByteLength(value) * 8;
var expected = largestAcknowledged.value + 1;
var win = 1UL << bits;
var hwin = win / 2;
var mask = win - 1;
var candidate = (expected & ~mask) | value;
if (candidate <= expected - hwin && candidate < (1 << 62) - win)
{
return(new PacketNumber(candidate + win));
}
if (candidate > expected + hwin && candidate >= win)
{
return(new PacketNumber(candidate - win));
}
return(new PacketNumber(candidate));
}
public static ReadOnlyMemory <byte> SliceVectorBytes(ReadOnlyMemory <byte> data, Range range, out ReadOnlyMemory <byte> remainings)
{
var lengthSizeInBytes = NetworkBitConverter.GetByteLength((ulong)range.End.Value);
if (data.Length < lengthSizeInBytes || lengthSizeInBytes > 4)
{
throw new EncodingException();
}
var lengthBytes = data.Slice(0, lengthSizeInBytes);
var length = (int)NetworkBitConverter.ParseUnaligned(lengthBytes.Span);
var afterLengthBytes = data.Slice(lengthSizeInBytes);
if (afterLengthBytes.Length < length || length < range.Start.Value || length > range.End.Value)
{
throw new EncodingException();
}
remainings = afterLengthBytes.Slice(length);
return(afterLengthBytes.Slice(0, length));
}
public static MemoryBuffer SliceVectorBytes(MemoryCursor cursor, Range range)
{
var lengthSizeInBytes = NetworkBitConverter.GetByteLength((ulong)range.End.Value);
if (lengthSizeInBytes > 4)
{
throw new EncodingException();
}
var lengthBytes = cursor.Move(lengthSizeInBytes);
var length = (int)NetworkBitConverter.ParseUnaligned(lengthBytes.Span);
if (length < range.Start.Value || length > range.End.Value)
{
throw new EncodingException();
}
var startOffset = cursor.AsOffset();
cursor.Move(length);
return(new MemoryBuffer(startOffset, length));
}